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We reanalyze the XMM--Newton data of GRB 011211 showing that the spectralfeatures, interpreted by Reeves et al. (2002, 2003) as due thermal emissionfrom a collisionally ionized plasma, can be also reproduced by a reflectionmodel (with ionization parameter $\xi\sim 10^2$). We discuss the implicationsof this interpretation, estimating the total mass required in the simplifiedcase of a funnel geometry. We conclude that a moderate clumping of thereprocessing material (corresponding to a filling factor of the order of $f\sim10^{-3}$) is required. Finally we show that, if this interpretation is correct,a bright quasi--thermal component is expected in the optical--UV band(containing about 90% of the luminosity of the illuminating continuum), whosepresence can be used to test the reflection model.Comment: revised version accepted for publication by A&

Reconsidering the origin of the X-ray emission lines in GRB 011211